Hy·phæ n. pl. Bot. The long, branching filaments of which the mycelium (and the greater part of the plant) of a fungus is formed. They are also found enveloping the gonidia of lichens, making up a large part of their structure.
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hypha
n : any of the threadlike filaments forming the mycelium of a
fungus
[also: hyphae (pl)]